Introduction of Programming- Video

BIOS and CMOS are two terms that many people think they know but cannot differentiate between. BIOS and CMOS are two different and distinct things in a computer, but being closely related, they are spoken of almost interchangeably. BIOS (basic Input Output System) is a program containing instructions for the start up of a computer, whereas CMOS (complimentary metal oxide semiconductor) is where all this BIOS information such as date, time, and system configuration details that are needed to start the computer are stored. Yes, they are closely related and perform very important functions at the startup of a computer but they cannot be more dissimilar also. Let us find the difference between BIOS and CMOS that seems to be so very confusing. In the simplest of terms, BIOS is a computer program that controls the computer when you switch on the power until the time the operating system of the computer takes over. Since BIOS is a firmware, it cannot store even this small bit of information, and CMOS it is that is used by BIOS to store the variable data.
Thus BIOS initializes and controls the computer on its startup with the help of variable data stored in a memory chip called CMOS.CMOS stores the information for as long as it receives power. This power is provided to it through a small battery. When you start the computer, it is BIOS that tests the system and readies it for operation searching for all the variable data that is stored on CMOS. After this, it also loads the OS and then passes control to it. What makes the situation confusing for people is the fact that as BIOS information is stored on a CMOS chip, the set up is also sometimes referred to as CMOS set up. BIOS are the programming that a computer uses during power on to get booted. It is also often the interface between the software and the hardware. BIOS used to be stored in read-only memory (ROM), and as such, was unchangeable; but more recently, BIOS is stored on an motherboard.
BIOS is the interface